圆孔型预旋喷嘴转静盘腔内流动换热特性数值研究
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摘要
运用RANS(数值求解三维)方程和SST(紊流模型)的方法研究了圆孔形预旋喷嘴转静盘腔内流动换热特性。通过数值计算获得的实验测量预旋盘腔内的阻力系数和努赛尔数与实验数据吻合良好,验证了数值方法的有效性。分析了3种不同进气预旋比和湍流系数对圆孔型预旋喷嘴转静盘腔内的流动换热特性的影响。研究结果表明:旋流比、阻力系数和转盘表面换热随着湍流系数的增大而增大。阻力系数由于受旋转泵效应的影响沿径向逐渐增大,受进气影响在进出口附近周向不均匀较为明显。进气预旋比较小时转盘对气流做功提高气流总温,当进气预旋比达到1.5左右时,转盘无需推动气流转动,气流总温相对较低。进气流冲击导致进气位置转盘表面Nu周向分布不均匀,并导致形成转盘表面强换热区。
The flow and heat transfer characteristics of the rotor stator cavity with circle pre-swirl nozzle structures was numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes( RANS) and SST turbulence model.The numerical drag coefficient and Nu coefficient distributions in the rotor stator cavity agreed well with the experimental data. The reliability of the utilized numerical method was also demonstrated. Three different turbulent flow parameters and pre-swirl ratios were used to analyze the flow and heat transfer performance of the rotor stator system with circle pre-swirl nozzles. The obtained results show as the turbulent flow parameter increases,swirl ratio,static pressure coefficient and the heat transfer on the rotating disc increase,and vary apparently along the circumference because of the impingement of the pre-swirl flow. The drag coefficient is gradually increasing along the radial direction due to the influence of the rotary pump,and the non-uniformity along the circumferential direction at the inlet and outlet position is observed due to the inlet pre-swirl flow influence. The rotational disc does work on the flow and increases the total temperature at the low pre-swirl inlet flow condition. The total temperature of the fluid is relative low at the pre-swirl ratio 1. 5 because the rotational disc does not do work on the airflow or drive the flow rotation. The inlet flow impinges on the rotational disc and results in the non-uniformity distribution of the Nu along the circumferential direction. This flow behavior leads to the high heat transfer region on the rotational disc surface.
The flow and heat transfer characteristics of the rotor stator cavity with circle pre-swirl nozzle structures was numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes( RANS) and SST turbulence model.The numerical drag coefficient and Nu coefficient distributions in the rotor stator cavity agreed well with the experimental data. The reliability of the utilized numerical method was also demonstrated. Three different turbulent flow parameters and pre-swirl ratios were used to analyze the flow and heat transfer performance of the rotor stator system with circle pre-swirl nozzles. The obtained results show as the turbulent flow parameter increases,swirl ratio,static pressure coefficient and the heat transfer on the rotating disc increase,and vary apparently along the circumference because of the impingement of the pre-swirl flow. The drag coefficient is gradually increasing along the radial direction due to the influence of the rotary pump,and the non-uniformity along the circumferential direction at the inlet and outlet position is observed due to the inlet pre-swirl flow influence. The rotational disc does work on the flow and increases the total temperature at the low pre-swirl inlet flow condition. The total temperature of the fluid is relative low at the pre-swirl ratio 1. 5 because the rotational disc does not do work on the airflow or drive the flow rotation. The inlet flow impinges on the rotational disc and results in the non-uniformity distribution of the Nu along the circumferential direction. This flow behavior leads to the high heat transfer region on the rotational disc surface.
引文
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[11]Newton PJ,Yan YY,Stevens NE,et al.Transient heat transfer measurements using thermochromic liquid xrystal.Part 1:An Improved Technique[J].International Journal of Heat and Fluid Flow,2003,24(1):14-22.
[2]陶加银,高庆,宋立明,李军.涡轮轮缘密封非定常主流入侵特性的数值研究[J],西安交通大学学报,2014,48(1):53-59.TAO Jia-yin,GAO Qing,SONG Li-ming,LI Jun,Numerical investigations on the unsteady mainstream ingestion characteristics of turbine rim seals[J],Journal Of Xi’an Jiaotong University,2014,48(1):53-59.
[3]Lock GD,Yan Y,Newton PJ,et al.Heat transfer measurements using liquid crystals in a preswirl rotating-disk system[J],ASME Journal of Engineering for Gas Turbines and Power,2005,127(4):375-382.
[4]Javiya U,Chew JW,Hills NJ,et al.CFD analysis of flow and heat transfer in a direct transfer preswirl system[J],ASME Journal of Turbomachinery,2012,134(5):031017-1-9.
[5]罗翔,冯野,徐国强,等,直接供气预旋转静系流动和换热数值模拟[J],航空动力学报,2012,27(10):2188-2193.LUO Xiang,FENG Ye,XU Guo-qiang,et al.Numerical simulation of flow and heat transfer performances in a direct transfer pre-swirl system[J],Journal of Aerospace Power,2012,27(10):2188-2193.
[6]陈淑仙,张靖周,谭晓茗,等,反向旋转盘腔内部流动特性[J],航空动力学报,2013,28(1):136-142.CHEN Shu-xian,ZHANG Jing-zhou,TAN Xiao-ming,et al.Flow characteristics inside counter-rotating disk cavity[J],Journal of Aerospace Power,2013,28(1):136-142.
[7]林立,吴康,谭勤学,等.小流量下转静系盘腔传热特性[J],航空动力学报,2015,30(9):2058-2065.LIN Li,WU Kang,TAN Qin-xue,et al.Heat transfer characteristics of rotor-stator cavity with small mass flow rate[J],Journal of Aerospace Power,2015,30(9):2058-2065.
[8]高庆,陶加银,宋立明,等.涡轮轮缘密封封严效率的数值研究[J],西安交通大学学报,2013,47(5):12-17.GAO Qing,TAO Jia-yin,SONG Li-ming,et al,Numerical investigation on the sealing efficiency of the turbine rim seal[J],Journal of Xi’an Jiaotong University,2013,47(5):12-17.
[9]LIAO Gao-liang,WANG Xin-jun,LI Jun,et al.Numerical investigation on the flow and heat transfer in a rotor-stator disc cavity[J].Applied Thermal Engineering,2015,87:10-23.
[10]Yan Y,Gord MF,Lock GD,et al.Fluid dynamics of a pre-swirl rotor-stator system[J].Journal Of Turbomachinery-Transactions Of the ASME,2003,125(4):641-647.
[11]Newton PJ,Yan YY,Stevens NE,et al.Transient heat transfer measurements using thermochromic liquid xrystal.Part 1:An Improved Technique[J].International Journal of Heat and Fluid Flow,2003,24(1):14-22.